Come to feel affection for fellow totally live on broadcast (4,2,4)
I believe the answer is:
fall in love
'come to feel affection' is the definition.
(to fall in love is to feel affection for someone)
'fellow totally live on broadcast' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'totally' becomes 'all' (I've seen this in another clue).
'broadcast' is an anagram indicator (letters scattered or cast around).
'live'+'on'='liveon'
'liveon' is an anagram of 'inlove'.
'f'+'all'+'inlove'='FALL IN LOVE'
'for' is the link.
(Other definitions for fall in love that I've seen before include "Go head over heels?" , "Become enraptured" .)